高心墙堆石坝抗震措施的数值模拟研究

Numerical Simulation Research on Seismic Measures of High Core Rockfill Dam

为解决高心墙堆石坝抗震安全问题,参考已建高心墙堆石坝工程的坝料土工试验结果,对比了坝顶附近堆石体加筋和坝料增模2种抗震措施,研究了5种计算方案在坝体加速度动力反应、地震永久变形等方面的抗震效果及差异性。结果表明,堆石体加筋对坝体的动力反应影响较大,对减小坝坡面永久变形的作用优于坝料增模措施,而坝料增模特别是心墙料增模措施对降低心墙永久变形的效果更好,因此将堆石体加筋和心墙料增模相结合是较为合理的抗震措施组合方案。

To solve seismic safety problems of high core rockfill dam, the soil test results of dam materials in the built high core rockfill dam engineering were referenced in this paper. The two seismic measures including both the rockfill reinforcement and the modulus increase of dam materials near the dam top were adopted in comparison, and the seismic effect and its difference on the dynamic acceleration response of dam body and the seismic permanent deformation under the five calculation schemes were studied. The results illustrate that the rockfill reinforcement has great impact on the dynamic response of the dam body and it plays a greater role on reducing the permanent deformation on dam face than the modulus increase measure. On the contrary, the effect on reducing the permanent deformation of core wall is better using the modulus increase measure of dam materials especially core wall material. Therefore, there is a relatively reasonable integrated scheme of seismic measure combining the rockfill reinforcement with the modulus increase of core wall material.